The latex explains why some witnesses thought she was wearing a trash bag. But calling it a "BDSM situation gone bad" is like saying someone tied to weights and thrown off a boat is a "diving situation gone bad". Unless all participants are willing and able to give consent, it's not BDSM. Is it possible that he took part in BDSM in the past? Latex lingerie and whips are pretty common in that community, so yes, it's a possibility. But we have no way of knowing either way just yet. BDSM relationships can also become abusive, but it doesn't sound like this is what happened here.